Resolution: 454*454pixels 372ppi, Charging Time: About 3.5 hours, ROM: 16 GB, Battery Capacity: 800mAh, Charging Type: Magnetic charging, Standby Time: About 5-7 days (7 days standby based on switching to the Persistent Mode), Using time: About 2-3 days, RAM: 2 GB, CPU: Dual Processor: MTK6739 1.25GHZ + NRF52840, Type: AMOLED, Size: 1.39inch.
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Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. There is one great coupon!
Link: Banggood product page
1. ($148.88): bgwp
you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): TTxBG10, 49kop, 20TFMC, kospet10, BGOP135, BG3CSUM, 8fbade, 502C6B, BGPro19, BGKOSPET20, BGKOSPET10, Email5
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Price history (for all/most countries) for Kospet Optimus 2/16GB Smart Watch is here. The lowest price was: $127.49.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).